38649780 has 144 divisors (see below), whose sum is σ = 128419200. Its totient is φ = 9351936.

The previous prime is 38649769. The next prime is 38649797. The reversal of 38649780 is 8794683.

It is a happy number.

38649780 is a `hidden beast` number, since 3 + 86 + 497 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 194121 + ... + 194319.

It is an arithmetic number, because the mean of its divisors is an integer number (891800).

Almost surely, 2^38649780 is an apocalyptic number.

38649780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38649780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64209600).

38649780 is an abundant number, since it is smaller than the sum of its proper divisors (89769420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38649780 is a wasteful number, since it uses less digits than its factorization.

38649780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 38649780 is about 6216.8947232521. The cubic root of 38649780 is about 338.1029878853.

The spelling of 38649780 in words is "thirty-eight million, six hundred forty-nine thousand, seven hundred eighty".